// Copyright 2006 Google Inc. All Rights Reserved.
package com.google.gwt.sample.mail.client;

import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * The top panel, which contains the 'welcome' message and various links.
 */
public class TopPanel extends Composite implements ClickListener
{

    private HTML signOutLink = new HTML("<a href='javascript:;'>Sign Out</a>");
    private HTML aboutLink = new HTML("<a href='javascript:;'>About</a>");

    public TopPanel()
    {
        HorizontalPanel outer = new HorizontalPanel();
        VerticalPanel inner = new VerticalPanel();

        outer.setHorizontalAlignment(HorizontalPanel.ALIGN_RIGHT);
        inner.setHorizontalAlignment(HorizontalPanel.ALIGN_RIGHT);

        HorizontalPanel links = new HorizontalPanel();
        links.setSpacing(4);
        links.add(signOutLink);
        links.add(aboutLink);

        outer.add(inner);
        inner.add(new HTML("<b>Welcome back, foo@example.com</b>"));
        inner.add(links);

        signOutLink.addClickListener(this);
        aboutLink.addClickListener(this);

        setWidget(outer);
        inner.setStyleName("mail-TopPanel");
        links.setStyleName("mail-TopPanelLinks");
    }

    public void onClick(Widget sender)
    {
        if (sender == signOutLink)
        {
            Window.alert("If this were implemented, you would be signed out now.");
        }
        else if (sender == aboutLink)
        {
            // When the 'About' item is selected, show the AboutDialog.
            // Note that showing a dialog box does not block -- execution continues
            // normally, and the dialog fires an event when it is closed.
            AboutDialog dlg = new AboutDialog();

            // Position it roughly in the middle of the screen.
            int left = (Window.getClientWidth() - 512) / 2;
            int top = (Window.getClientHeight() - 256) / 2;
            dlg.setPopupPosition(left, top);

            dlg.show();
        }
    }
}
